________________ treatment is done for appreciable improvement in viscosity index of lubricating oil?
Correct answer: B. Solvent extraction
- A. Acid
- B. Solvent extraction
- C. Alkali
- D. Clay
Explanation
Solvent extraction removes low-viscosity-index aromatic components from lubricating oil, thereby producing an appreciable improvement in viscosity index. Acid, alkali, and clay treatments mainly serve other purification purposes.
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